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[IB] srp: don't post receive if no send buf available
[linux-2.6/mini2440.git] / drivers / infiniband / ulp / srp / ib_srp.c
blobee9fe226ae994408f50b1180632c8c4b9ba7d7db
1 /*
2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
33 */
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/err.h>
39 #include <linux/string.h>
40 #include <linux/parser.h>
41 #include <linux/random.h>
42
43 #include <asm/atomic.h>
44
45 #include <scsi/scsi.h>
46 #include <scsi/scsi_device.h>
47 #include <scsi/scsi_dbg.h>
48 #include <scsi/srp.h>
49
50 #include <rdma/ib_cache.h>
51
52 #include "ib_srp.h"
53
54 #define DRV_NAME "ib_srp"
55 #define PFX DRV_NAME ": "
56 #define DRV_VERSION "0.2"
57 #define DRV_RELDATE "November 1, 2005"
58
59 MODULE_AUTHOR("Roland Dreier");
60 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
61 "v" DRV_VERSION " (" DRV_RELDATE ")");
62 MODULE_LICENSE("Dual BSD/GPL");
63
64 static int topspin_workarounds = 1;
65
66 module_param(topspin_workarounds, int, 0444);
67 MODULE_PARM_DESC(topspin_workarounds,
68 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
69
70 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
71
72 static void srp_add_one(struct ib_device *device);
73 static void srp_remove_one(struct ib_device *device);
74 static void srp_completion(struct ib_cq *cq, void *target_ptr);
75 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
76
77 static struct ib_client srp_client = {
78 .name = "srp",
79 .add = srp_add_one,
80 .remove = srp_remove_one
81 };
82
83 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
84 {
85 return (struct srp_target_port *) host->hostdata;
86 }
87
88 static const char *srp_target_info(struct Scsi_Host *host)
89 {
90 return host_to_target(host)->target_name;
91 }
92
93 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
94 gfp_t gfp_mask,
95 enum dma_data_direction direction)
96 {
97 struct srp_iu *iu;
98
99 iu = kmalloc(sizeof *iu, gfp_mask);
100 if (!iu)
101 goto out;
102
103 iu->buf = kzalloc(size, gfp_mask);
104 if (!iu->buf)
105 goto out_free_iu;
106
107 iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
108 if (dma_mapping_error(iu->dma))
109 goto out_free_buf;
110
111 iu->size = size;
112 iu->direction = direction;
113
114 return iu;
115
116 out_free_buf:
117 kfree(iu->buf);
118 out_free_iu:
119 kfree(iu);
120 out:
121 return NULL;
122 }
123
124 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
125 {
126 if (!iu)
127 return;
128
129 dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
130 kfree(iu->buf);
131 kfree(iu);
132 }
133
134 static void srp_qp_event(struct ib_event *event, void *context)
135 {
136 printk(KERN_ERR PFX "QP event %d\n", event->event);
137 }
138
139 static int srp_init_qp(struct srp_target_port *target,
140 struct ib_qp *qp)
141 {
142 struct ib_qp_attr *attr;
143 int ret;
144
145 attr = kmalloc(sizeof *attr, GFP_KERNEL);
146 if (!attr)
147 return -ENOMEM;
148
149 ret = ib_find_cached_pkey(target->srp_host->dev,
150 target->srp_host->port,
151 be16_to_cpu(target->path.pkey),
152 &attr->pkey_index);
153 if (ret)
154 goto out;
155
156 attr->qp_state = IB_QPS_INIT;
157 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
158 IB_ACCESS_REMOTE_WRITE);
159 attr->port_num = target->srp_host->port;
160
161 ret = ib_modify_qp(qp, attr,
162 IB_QP_STATE |
163 IB_QP_PKEY_INDEX |
164 IB_QP_ACCESS_FLAGS |
165 IB_QP_PORT);
166
167 out:
168 kfree(attr);
169 return ret;
170 }
171
172 static int srp_create_target_ib(struct srp_target_port *target)
173 {
174 struct ib_qp_init_attr *init_attr;
175 int ret;
176
177 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
178 if (!init_attr)
179 return -ENOMEM;
180
181 target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
182 NULL, target, SRP_CQ_SIZE);
183 if (IS_ERR(target->cq)) {
184 ret = PTR_ERR(target->cq);
185 goto out;
186 }
187
188 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
189
190 init_attr->event_handler = srp_qp_event;
191 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
192 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
193 init_attr->cap.max_recv_sge = 1;
194 init_attr->cap.max_send_sge = 1;
195 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
196 init_attr->qp_type = IB_QPT_RC;
197 init_attr->send_cq = target->cq;
198 init_attr->recv_cq = target->cq;
199
200 target->qp = ib_create_qp(target->srp_host->pd, init_attr);
201 if (IS_ERR(target->qp)) {
202 ret = PTR_ERR(target->qp);
203 ib_destroy_cq(target->cq);
204 goto out;
205 }
206
207 ret = srp_init_qp(target, target->qp);
208 if (ret) {
209 ib_destroy_qp(target->qp);
210 ib_destroy_cq(target->cq);
211 goto out;
212 }
213
214 out:
215 kfree(init_attr);
216 return ret;
217 }
218
219 static void srp_free_target_ib(struct srp_target_port *target)
220 {
221 int i;
222
223 ib_destroy_qp(target->qp);
224 ib_destroy_cq(target->cq);
225
226 for (i = 0; i < SRP_RQ_SIZE; ++i)
227 srp_free_iu(target->srp_host, target->rx_ring[i]);
228 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
229 srp_free_iu(target->srp_host, target->tx_ring[i]);
230 }
231
232 static void srp_path_rec_completion(int status,
233 struct ib_sa_path_rec *pathrec,
234 void *target_ptr)
235 {
236 struct srp_target_port *target = target_ptr;
237
238 target->status = status;
239 if (status)
240 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
241 else
242 target->path = *pathrec;
243 complete(&target->done);
244 }
245
246 static int srp_lookup_path(struct srp_target_port *target)
247 {
248 target->path.numb_path = 1;
249
250 init_completion(&target->done);
251
252 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
253 target->srp_host->port,
254 &target->path,
255 IB_SA_PATH_REC_DGID |
256 IB_SA_PATH_REC_SGID |
257 IB_SA_PATH_REC_NUMB_PATH |
258 IB_SA_PATH_REC_PKEY,
259 SRP_PATH_REC_TIMEOUT_MS,
260 GFP_KERNEL,
261 srp_path_rec_completion,
262 target, &target->path_query);
263 if (target->path_query_id < 0)
264 return target->path_query_id;
265
266 wait_for_completion(&target->done);
267
268 if (target->status < 0)
269 printk(KERN_WARNING PFX "Path record query failed\n");
270
271 return target->status;
272 }
273
274 static int srp_send_req(struct srp_target_port *target)
275 {
276 struct {
277 struct ib_cm_req_param param;
278 struct srp_login_req priv;
279 } *req = NULL;
280 int status;
281
282 req = kzalloc(sizeof *req, GFP_KERNEL);
283 if (!req)
284 return -ENOMEM;
285
286 req->param.primary_path = &target->path;
287 req->param.alternate_path = NULL;
288 req->param.service_id = target->service_id;
289 req->param.qp_num = target->qp->qp_num;
290 req->param.qp_type = target->qp->qp_type;
291 req->param.private_data = &req->priv;
292 req->param.private_data_len = sizeof req->priv;
293 req->param.flow_control = 1;
294
295 get_random_bytes(&req->param.starting_psn, 4);
296 req->param.starting_psn &= 0xffffff;
297
298 /*
299 * Pick some arbitrary defaults here; we could make these
300 * module parameters if anyone cared about setting them.
301 */
302 req->param.responder_resources = 4;
303 req->param.remote_cm_response_timeout = 20;
304 req->param.local_cm_response_timeout = 20;
305 req->param.retry_count = 7;
306 req->param.rnr_retry_count = 7;
307 req->param.max_cm_retries = 15;
308
309 req->priv.opcode = SRP_LOGIN_REQ;
310 req->priv.tag = 0;
311 req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
312 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
313 SRP_BUF_FORMAT_INDIRECT);
314 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
315 /*
316 * Topspin/Cisco SRP targets will reject our login unless we
317 * zero out the first 8 bytes of our initiator port ID. The
318 * second 8 bytes must be our local node GUID, but we always
319 * use that anyway.
320 */
321 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
322 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
323 "activated for target GUID %016llx\n",
324 (unsigned long long) be64_to_cpu(target->ioc_guid));
325 memset(req->priv.initiator_port_id, 0, 8);
326 }
327 memcpy(req->priv.target_port_id, &target->id_ext, 8);
328 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
329
330 status = ib_send_cm_req(target->cm_id, &req->param);
331
332 kfree(req);
333
334 return status;
335 }
336
337 static void srp_disconnect_target(struct srp_target_port *target)
338 {
339 /* XXX should send SRP_I_LOGOUT request */
340
341 init_completion(&target->done);
342 ib_send_cm_dreq(target->cm_id, NULL, 0);
343 wait_for_completion(&target->done);
344 }
345
346 static void srp_remove_work(void *target_ptr)
347 {
348 struct srp_target_port *target = target_ptr;
349
350 spin_lock_irq(target->scsi_host->host_lock);
351 if (target->state != SRP_TARGET_DEAD) {
352 spin_unlock_irq(target->scsi_host->host_lock);
353 scsi_host_put(target->scsi_host);
354 return;
355 }
356 target->state = SRP_TARGET_REMOVED;
357 spin_unlock_irq(target->scsi_host->host_lock);
358
359 down(&target->srp_host->target_mutex);
360 list_del(&target->list);
361 up(&target->srp_host->target_mutex);
362
363 scsi_remove_host(target->scsi_host);
364 ib_destroy_cm_id(target->cm_id);
365 srp_free_target_ib(target);
366 scsi_host_put(target->scsi_host);
367 /* And another put to really free the target port... */
368 scsi_host_put(target->scsi_host);
369 }
370
371 static int srp_connect_target(struct srp_target_port *target)
372 {
373 int ret;
374
375 ret = srp_lookup_path(target);
376 if (ret)
377 return ret;
378
379 while (1) {
380 init_completion(&target->done);
381 ret = srp_send_req(target);
382 if (ret)
383 return ret;
384 wait_for_completion(&target->done);
385
386 /*
387 * The CM event handling code will set status to
388 * SRP_PORT_REDIRECT if we get a port redirect REJ
389 * back, or SRP_DLID_REDIRECT if we get a lid/qp
390 * redirect REJ back.
391 */
392 switch (target->status) {
393 case 0:
394 return 0;
395
396 case SRP_PORT_REDIRECT:
397 ret = srp_lookup_path(target);
398 if (ret)
399 return ret;
400 break;
401
402 case SRP_DLID_REDIRECT:
403 break;
404
405 default:
406 return target->status;
407 }
408 }
409 }
410
411 static int srp_reconnect_target(struct srp_target_port *target)
412 {
413 struct ib_cm_id *new_cm_id;
414 struct ib_qp_attr qp_attr;
415 struct srp_request *req;
416 struct ib_wc wc;
417 int ret;
418 int i;
419
420 spin_lock_irq(target->scsi_host->host_lock);
421 if (target->state != SRP_TARGET_LIVE) {
422 spin_unlock_irq(target->scsi_host->host_lock);
423 return -EAGAIN;
424 }
425 target->state = SRP_TARGET_CONNECTING;
426 spin_unlock_irq(target->scsi_host->host_lock);
427
428 srp_disconnect_target(target);
429 /*
430 * Now get a new local CM ID so that we avoid confusing the
431 * target in case things are really fouled up.
432 */
433 new_cm_id = ib_create_cm_id(target->srp_host->dev,
434 srp_cm_handler, target);
435 if (IS_ERR(new_cm_id)) {
436 ret = PTR_ERR(new_cm_id);
437 goto err;
438 }
439 ib_destroy_cm_id(target->cm_id);
440 target->cm_id = new_cm_id;
441
442 qp_attr.qp_state = IB_QPS_RESET;
443 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
444 if (ret)
445 goto err;
446
447 ret = srp_init_qp(target, target->qp);
448 if (ret)
449 goto err;
450
451 while (ib_poll_cq(target->cq, 1, &wc) > 0)
452 ; /* nothing */
453
454 list_for_each_entry(req, &target->req_queue, list) {
455 req->scmnd->result = DID_RESET << 16;
456 req->scmnd->scsi_done(req->scmnd);
457 }
458
459 target->rx_head = 0;
460 target->tx_head = 0;
461 target->tx_tail = 0;
462 target->req_head = 0;
463 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
464 target->req_ring[i].next = i + 1;
465 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
466 INIT_LIST_HEAD(&target->req_queue);
467
468 ret = srp_connect_target(target);
469 if (ret)
470 goto err;
471
472 spin_lock_irq(target->scsi_host->host_lock);
473 if (target->state == SRP_TARGET_CONNECTING) {
474 ret = 0;
475 target->state = SRP_TARGET_LIVE;
476 } else
477 ret = -EAGAIN;
478 spin_unlock_irq(target->scsi_host->host_lock);
479
480 return ret;
481
482 err:
483 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
484
485 /*
486 * We couldn't reconnect, so kill our target port off.
487 * However, we have to defer the real removal because we might
488 * be in the context of the SCSI error handler now, which
489 * would deadlock if we call scsi_remove_host().
490 */
491 spin_lock_irq(target->scsi_host->host_lock);
492 if (target->state == SRP_TARGET_CONNECTING) {
493 target->state = SRP_TARGET_DEAD;
494 INIT_WORK(&target->work, srp_remove_work, target);
495 schedule_work(&target->work);
496 }
497 spin_unlock_irq(target->scsi_host->host_lock);
498
499 return ret;
500 }
501
502 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
503 struct srp_request *req)
504 {
505 struct srp_cmd *cmd = req->cmd->buf;
506 int len;
507 u8 fmt;
508
509 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
510 return sizeof (struct srp_cmd);
511
512 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
513 scmnd->sc_data_direction != DMA_TO_DEVICE) {
514 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
515 scmnd->sc_data_direction);
516 return -EINVAL;
517 }
518
519 if (scmnd->use_sg) {
520 struct scatterlist *scat = scmnd->request_buffer;
521 int n;
522 int i;
523
524 n = dma_map_sg(target->srp_host->dev->dma_device,
525 scat, scmnd->use_sg, scmnd->sc_data_direction);
526
527 if (n == 1) {
528 struct srp_direct_buf *buf = (void *) cmd->add_data;
529
530 fmt = SRP_DATA_DESC_DIRECT;
531
532 buf->va = cpu_to_be64(sg_dma_address(scat));
533 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
534 buf->len = cpu_to_be32(sg_dma_len(scat));
535
536 len = sizeof (struct srp_cmd) +
537 sizeof (struct srp_direct_buf);
538 } else {
539 struct srp_indirect_buf *buf = (void *) cmd->add_data;
540 u32 datalen = 0;
541
542 fmt = SRP_DATA_DESC_INDIRECT;
543
544 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
545 cmd->data_out_desc_cnt = n;
546 else
547 cmd->data_in_desc_cnt = n;
548
549 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
550 sizeof *cmd +
551 sizeof *buf);
552 buf->table_desc.key =
553 cpu_to_be32(target->srp_host->mr->rkey);
554 buf->table_desc.len =
555 cpu_to_be32(n * sizeof (struct srp_direct_buf));
556
557 for (i = 0; i < n; ++i) {
558 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
559 buf->desc_list[i].key =
560 cpu_to_be32(target->srp_host->mr->rkey);
561 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
562
563 datalen += sg_dma_len(&scat[i]);
564 }
565
566 buf->len = cpu_to_be32(datalen);
567
568 len = sizeof (struct srp_cmd) +
569 sizeof (struct srp_indirect_buf) +
570 n * sizeof (struct srp_direct_buf);
571 }
572 } else {
573 struct srp_direct_buf *buf = (void *) cmd->add_data;
574 dma_addr_t dma;
575
576 dma = dma_map_single(target->srp_host->dev->dma_device,
577 scmnd->request_buffer, scmnd->request_bufflen,
578 scmnd->sc_data_direction);
579 if (dma_mapping_error(dma)) {
580 printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
581 scmnd->request_buffer, (int) scmnd->request_bufflen,
582 scmnd->sc_data_direction);
583 return -EINVAL;
584 }
585
586 pci_unmap_addr_set(req, direct_mapping, dma);
587
588 buf->va = cpu_to_be64(dma);
589 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
590 buf->len = cpu_to_be32(scmnd->request_bufflen);
591
592 fmt = SRP_DATA_DESC_DIRECT;
593
594 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
595 }
596
597 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
598 cmd->buf_fmt = fmt << 4;
599 else
600 cmd->buf_fmt = fmt;
601
602
603 return len;
604 }
605
606 static void srp_unmap_data(struct scsi_cmnd *scmnd,
607 struct srp_target_port *target,
608 struct srp_request *req)
609 {
610 if (!scmnd->request_buffer ||
611 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
612 scmnd->sc_data_direction != DMA_FROM_DEVICE))
613 return;
614
615 if (scmnd->use_sg)
616 dma_unmap_sg(target->srp_host->dev->dma_device,
617 (struct scatterlist *) scmnd->request_buffer,
618 scmnd->use_sg, scmnd->sc_data_direction);
619 else
620 dma_unmap_single(target->srp_host->dev->dma_device,
621 pci_unmap_addr(req, direct_mapping),
622 scmnd->request_bufflen,
623 scmnd->sc_data_direction);
624 }
625
626 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
627 {
628 struct srp_request *req;
629 struct scsi_cmnd *scmnd;
630 unsigned long flags;
631 s32 delta;
632
633 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
634
635 spin_lock_irqsave(target->scsi_host->host_lock, flags);
636
637 target->req_lim += delta;
638
639 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
640
641 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
642 if (be32_to_cpu(rsp->resp_data_len) < 4)
643 req->tsk_status = -1;
644 else
645 req->tsk_status = rsp->data[3];
646 complete(&req->done);
647 } else {
648 scmnd = req->scmnd;
649 if (!scmnd)
650 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
651 (unsigned long long) rsp->tag);
652 scmnd->result = rsp->status;
653
654 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
655 memcpy(scmnd->sense_buffer, rsp->data +
656 be32_to_cpu(rsp->resp_data_len),
657 min_t(int, be32_to_cpu(rsp->sense_data_len),
658 SCSI_SENSE_BUFFERSIZE));
659 }
660
661 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
662 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
663 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
664 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
665
666 srp_unmap_data(scmnd, target, req);
667
668 if (!req->tsk_mgmt) {
669 req->scmnd = NULL;
670 scmnd->host_scribble = (void *) -1L;
671 scmnd->scsi_done(scmnd);
672
673 list_del(&req->list);
674 req->next = target->req_head;
675 target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
676 } else
677 req->cmd_done = 1;
678 }
679
680 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
681 }
682
683 static void srp_reconnect_work(void *target_ptr)
684 {
685 struct srp_target_port *target = target_ptr;
686
687 srp_reconnect_target(target);
688 }
689
690 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
691 {
692 struct srp_iu *iu;
693 u8 opcode;
694
695 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
696
697 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
698 target->max_ti_iu_len, DMA_FROM_DEVICE);
699
700 opcode = *(u8 *) iu->buf;
701
702 if (0) {
703 int i;
704
705 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
706
707 for (i = 0; i < wc->byte_len; ++i) {
708 if (i % 8 == 0)
709 printk(KERN_ERR " [%02x] ", i);
710 printk(" %02x", ((u8 *) iu->buf)[i]);
711 if ((i + 1) % 8 == 0)
712 printk("\n");
713 }
714
715 if (wc->byte_len % 8)
716 printk("\n");
717 }
718
719 switch (opcode) {
720 case SRP_RSP:
721 srp_process_rsp(target, iu->buf);
722 break;
723
724 case SRP_T_LOGOUT:
725 /* XXX Handle target logout */
726 printk(KERN_WARNING PFX "Got target logout request\n");
727 break;
728
729 default:
730 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
731 break;
732 }
733
734 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
735 target->max_ti_iu_len, DMA_FROM_DEVICE);
736 }
737
738 static void srp_completion(struct ib_cq *cq, void *target_ptr)
739 {
740 struct srp_target_port *target = target_ptr;
741 struct ib_wc wc;
742 unsigned long flags;
743
744 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
745 while (ib_poll_cq(cq, 1, &wc) > 0) {
746 if (wc.status) {
747 printk(KERN_ERR PFX "failed %s status %d\n",
748 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
749 wc.status);
750 spin_lock_irqsave(target->scsi_host->host_lock, flags);
751 if (target->state == SRP_TARGET_LIVE)
752 schedule_work(&target->work);
753 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
754 break;
755 }
756
757 if (wc.wr_id & SRP_OP_RECV)
758 srp_handle_recv(target, &wc);
759 else
760 ++target->tx_tail;
761 }
762 }
763
764 static int __srp_post_recv(struct srp_target_port *target)
765 {
766 struct srp_iu *iu;
767 struct ib_sge list;
768 struct ib_recv_wr wr, *bad_wr;
769 unsigned int next;
770 int ret;
771
772 next = target->rx_head & (SRP_RQ_SIZE - 1);
773 wr.wr_id = next | SRP_OP_RECV;
774 iu = target->rx_ring[next];
775
776 list.addr = iu->dma;
777 list.length = iu->size;
778 list.lkey = target->srp_host->mr->lkey;
779
780 wr.next = NULL;
781 wr.sg_list = &list;
782 wr.num_sge = 1;
783
784 ret = ib_post_recv(target->qp, &wr, &bad_wr);
785 if (!ret)
786 ++target->rx_head;
787
788 return ret;
789 }
790
791 static int srp_post_recv(struct srp_target_port *target)
792 {
793 unsigned long flags;
794 int ret;
795
796 spin_lock_irqsave(target->scsi_host->host_lock, flags);
797 ret = __srp_post_recv(target);
798 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
799
800 return ret;
801 }
802
803 /*
804 * Must be called with target->scsi_host->host_lock held to protect
805 * req_lim and tx_head. Lock cannot be dropped between call here and
806 * call to __srp_post_send().
807 */
808 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
809 {
810 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
811 return NULL;
812
813 if (unlikely(target->req_lim < 1)) {
814 if (printk_ratelimit())
815 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
816 target->req_lim);
817 return NULL;
818 }
819
820 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
821 }
822
823 /*
824 * Must be called with target->scsi_host->host_lock held to protect
825 * req_lim and tx_head.
826 */
827 static int __srp_post_send(struct srp_target_port *target,
828 struct srp_iu *iu, int len)
829 {
830 struct ib_sge list;
831 struct ib_send_wr wr, *bad_wr;
832 int ret = 0;
833
834 list.addr = iu->dma;
835 list.length = len;
836 list.lkey = target->srp_host->mr->lkey;
837
838 wr.next = NULL;
839 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
840 wr.sg_list = &list;
841 wr.num_sge = 1;
842 wr.opcode = IB_WR_SEND;
843 wr.send_flags = IB_SEND_SIGNALED;
844
845 ret = ib_post_send(target->qp, &wr, &bad_wr);
846
847 if (!ret) {
848 ++target->tx_head;
849 --target->req_lim;
850 }
851
852 return ret;
853 }
854
855 static int srp_queuecommand(struct scsi_cmnd *scmnd,
856 void (*done)(struct scsi_cmnd *))
857 {
858 struct srp_target_port *target = host_to_target(scmnd->device->host);
859 struct srp_request *req;
860 struct srp_iu *iu;
861 struct srp_cmd *cmd;
862 long req_index;
863 int len;
864
865 if (target->state == SRP_TARGET_CONNECTING)
866 goto err;
867
868 if (target->state == SRP_TARGET_DEAD ||
869 target->state == SRP_TARGET_REMOVED) {
870 scmnd->result = DID_BAD_TARGET << 16;
871 done(scmnd);
872 return 0;
873 }
874
875 iu = __srp_get_tx_iu(target);
876 if (!iu)
877 goto err;
878
879 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
880 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
881
882 req_index = target->req_head;
883
884 scmnd->scsi_done = done;
885 scmnd->result = 0;
886 scmnd->host_scribble = (void *) req_index;
887
888 cmd = iu->buf;
889 memset(cmd, 0, sizeof *cmd);
890
891 cmd->opcode = SRP_CMD;
892 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
893 cmd->tag = req_index;
894 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
895
896 req = &target->req_ring[req_index];
897
898 req->scmnd = scmnd;
899 req->cmd = iu;
900 req->cmd_done = 0;
901 req->tsk_mgmt = NULL;
902
903 len = srp_map_data(scmnd, target, req);
904 if (len < 0) {
905 printk(KERN_ERR PFX "Failed to map data\n");
906 goto err;
907 }
908
909 if (__srp_post_recv(target)) {
910 printk(KERN_ERR PFX "Recv failed\n");
911 goto err_unmap;
912 }
913
914 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
915 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
916
917 if (__srp_post_send(target, iu, len)) {
918 printk(KERN_ERR PFX "Send failed\n");
919 goto err_unmap;
920 }
921
922 target->req_head = req->next;
923 list_add_tail(&req->list, &target->req_queue);
924
925 return 0;
926
927 err_unmap:
928 srp_unmap_data(scmnd, target, req);
929
930 err:
931 return SCSI_MLQUEUE_HOST_BUSY;
932 }
933
934 static int srp_alloc_iu_bufs(struct srp_target_port *target)
935 {
936 int i;
937
938 for (i = 0; i < SRP_RQ_SIZE; ++i) {
939 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
940 target->max_ti_iu_len,
941 GFP_KERNEL, DMA_FROM_DEVICE);
942 if (!target->rx_ring[i])
943 goto err;
944 }
945
946 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
947 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
948 SRP_MAX_IU_LEN,
949 GFP_KERNEL, DMA_TO_DEVICE);
950 if (!target->tx_ring[i])
951 goto err;
952 }
953
954 return 0;
955
956 err:
957 for (i = 0; i < SRP_RQ_SIZE; ++i) {
958 srp_free_iu(target->srp_host, target->rx_ring[i]);
959 target->rx_ring[i] = NULL;
960 }
961
962 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
963 srp_free_iu(target->srp_host, target->tx_ring[i]);
964 target->tx_ring[i] = NULL;
965 }
966
967 return -ENOMEM;
968 }
969
970 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
971 struct ib_cm_event *event,
972 struct srp_target_port *target)
973 {
974 struct ib_class_port_info *cpi;
975 int opcode;
976
977 switch (event->param.rej_rcvd.reason) {
978 case IB_CM_REJ_PORT_CM_REDIRECT:
979 cpi = event->param.rej_rcvd.ari;
980 target->path.dlid = cpi->redirect_lid;
981 target->path.pkey = cpi->redirect_pkey;
982 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
983 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
984
985 target->status = target->path.dlid ?
986 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
987 break;
988
989 case IB_CM_REJ_PORT_REDIRECT:
990 if (topspin_workarounds &&
991 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
992 /*
993 * Topspin/Cisco SRP gateways incorrectly send
994 * reject reason code 25 when they mean 24
995 * (port redirect).
996 */
997 memcpy(target->path.dgid.raw,
998 event->param.rej_rcvd.ari, 16);
999
1000 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1001 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1002 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1003
1004 target->status = SRP_PORT_REDIRECT;
1005 } else {
1006 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1007 target->status = -ECONNRESET;
1008 }
1009 break;
1010
1011 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1012 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1013 target->status = -ECONNRESET;
1014 break;
1015
1016 case IB_CM_REJ_CONSUMER_DEFINED:
1017 opcode = *(u8 *) event->private_data;
1018 if (opcode == SRP_LOGIN_REJ) {
1019 struct srp_login_rej *rej = event->private_data;
1020 u32 reason = be32_to_cpu(rej->reason);
1021
1022 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1023 printk(KERN_WARNING PFX
1024 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1025 else
1026 printk(KERN_WARNING PFX
1027 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1028 } else
1029 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1030 " opcode 0x%02x\n", opcode);
1031 target->status = -ECONNRESET;
1032 break;
1033
1034 default:
1035 printk(KERN_WARNING " REJ reason 0x%x\n",
1036 event->param.rej_rcvd.reason);
1037 target->status = -ECONNRESET;
1038 }
1039 }
1040
1041 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1042 {
1043 struct srp_target_port *target = cm_id->context;
1044 struct ib_qp_attr *qp_attr = NULL;
1045 int attr_mask = 0;
1046 int comp = 0;
1047 int opcode = 0;
1048
1049 switch (event->event) {
1050 case IB_CM_REQ_ERROR:
1051 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1052 comp = 1;
1053 target->status = -ECONNRESET;
1054 break;
1055
1056 case IB_CM_REP_RECEIVED:
1057 comp = 1;
1058 opcode = *(u8 *) event->private_data;
1059
1060 if (opcode == SRP_LOGIN_RSP) {
1061 struct srp_login_rsp *rsp = event->private_data;
1062
1063 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1064 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1065
1066 target->scsi_host->can_queue = min(target->req_lim,
1067 target->scsi_host->can_queue);
1068 } else {
1069 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1070 target->status = -ECONNRESET;
1071 break;
1072 }
1073
1074 target->status = srp_alloc_iu_bufs(target);
1075 if (target->status)
1076 break;
1077
1078 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1079 if (!qp_attr) {
1080 target->status = -ENOMEM;
1081 break;
1082 }
1083
1084 qp_attr->qp_state = IB_QPS_RTR;
1085 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1086 if (target->status)
1087 break;
1088
1089 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1090 if (target->status)
1091 break;
1092
1093 target->status = srp_post_recv(target);
1094 if (target->status)
1095 break;
1096
1097 qp_attr->qp_state = IB_QPS_RTS;
1098 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1099 if (target->status)
1100 break;
1101
1102 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1103 if (target->status)
1104 break;
1105
1106 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1107 if (target->status)
1108 break;
1109
1110 break;
1111
1112 case IB_CM_REJ_RECEIVED:
1113 printk(KERN_DEBUG PFX "REJ received\n");
1114 comp = 1;
1115
1116 srp_cm_rej_handler(cm_id, event, target);
1117 break;
1118
1119 case IB_CM_MRA_RECEIVED:
1120 printk(KERN_ERR PFX "MRA received\n");
1121 break;
1122
1123 case IB_CM_DREP_RECEIVED:
1124 break;
1125
1126 case IB_CM_TIMEWAIT_EXIT:
1127 printk(KERN_ERR PFX "connection closed\n");
1128
1129 comp = 1;
1130 target->status = 0;
1131 break;
1132
1133 default:
1134 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1135 break;
1136 }
1137
1138 if (comp)
1139 complete(&target->done);
1140
1141 kfree(qp_attr);
1142
1143 return 0;
1144 }
1145
1146 static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
1147 {
1148 struct srp_target_port *target = host_to_target(scmnd->device->host);
1149 struct srp_request *req;
1150 struct srp_iu *iu;
1151 struct srp_tsk_mgmt *tsk_mgmt;
1152 int req_index;
1153 int ret = FAILED;
1154
1155 spin_lock_irq(target->scsi_host->host_lock);
1156
1157 if (scmnd->host_scribble == (void *) -1L)
1158 goto out;
1159
1160 req_index = (long) scmnd->host_scribble;
1161 printk(KERN_ERR "Abort for req_index %d\n", req_index);
1162
1163 req = &target->req_ring[req_index];
1164 init_completion(&req->done);
1165
1166 iu = __srp_get_tx_iu(target);
1167 if (!iu)
1168 goto out;
1169
1170 tsk_mgmt = iu->buf;
1171 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1172
1173 tsk_mgmt->opcode = SRP_TSK_MGMT;
1174 tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1175 tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
1176 tsk_mgmt->tsk_mgmt_func = func;
1177 tsk_mgmt->task_tag = req_index;
1178
1179 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1180 goto out;
1181
1182 req->tsk_mgmt = iu;
1183
1184 spin_unlock_irq(target->scsi_host->host_lock);
1185 if (!wait_for_completion_timeout(&req->done,
1186 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1187 return FAILED;
1188 spin_lock_irq(target->scsi_host->host_lock);
1189
1190 if (req->cmd_done) {
1191 list_del(&req->list);
1192 req->next = target->req_head;
1193 target->req_head = req_index;
1194
1195 scmnd->scsi_done(scmnd);
1196 } else if (!req->tsk_status) {
1197 scmnd->result = DID_ABORT << 16;
1198 ret = SUCCESS;
1199 }
1200
1201 out:
1202 spin_unlock_irq(target->scsi_host->host_lock);
1203 return ret;
1204 }
1205
1206 static int srp_abort(struct scsi_cmnd *scmnd)
1207 {
1208 printk(KERN_ERR "SRP abort called\n");
1209
1210 return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
1211 }
1212
1213 static int srp_reset_device(struct scsi_cmnd *scmnd)
1214 {
1215 printk(KERN_ERR "SRP reset_device called\n");
1216
1217 return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
1218 }
1219
1220 static int srp_reset_host(struct scsi_cmnd *scmnd)
1221 {
1222 struct srp_target_port *target = host_to_target(scmnd->device->host);
1223 int ret = FAILED;
1224
1225 printk(KERN_ERR PFX "SRP reset_host called\n");
1226
1227 if (!srp_reconnect_target(target))
1228 ret = SUCCESS;
1229
1230 return ret;
1231 }
1232
1233 static struct scsi_host_template srp_template = {
1234 .module = THIS_MODULE,
1235 .name = DRV_NAME,
1236 .info = srp_target_info,
1237 .queuecommand = srp_queuecommand,
1238 .eh_abort_handler = srp_abort,
1239 .eh_device_reset_handler = srp_reset_device,
1240 .eh_host_reset_handler = srp_reset_host,
1241 .can_queue = SRP_SQ_SIZE,
1242 .this_id = -1,
1243 .sg_tablesize = SRP_MAX_INDIRECT,
1244 .cmd_per_lun = SRP_SQ_SIZE,
1245 .use_clustering = ENABLE_CLUSTERING
1246 };
1247
1248 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1249 {
1250 sprintf(target->target_name, "SRP.T10:%016llX",
1251 (unsigned long long) be64_to_cpu(target->id_ext));
1252
1253 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1254 return -ENODEV;
1255
1256 down(&host->target_mutex);
1257 list_add_tail(&target->list, &host->target_list);
1258 up(&host->target_mutex);
1259
1260 target->state = SRP_TARGET_LIVE;
1261
1262 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1263 scsi_scan_target(&target->scsi_host->shost_gendev,
1264 0, target->scsi_id, ~0, 0);
1265
1266 return 0;
1267 }
1268
1269 static void srp_release_class_dev(struct class_device *class_dev)
1270 {
1271 struct srp_host *host =
1272 container_of(class_dev, struct srp_host, class_dev);
1273
1274 complete(&host->released);
1275 }
1276
1277 static struct class srp_class = {
1278 .name = "infiniband_srp",
1279 .release = srp_release_class_dev
1280 };
1281
1282 /*
1283 * Target ports are added by writing
1284 *
1285 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1286 * pkey=<P_Key>,service_id=<service ID>
1287 *
1288 * to the add_target sysfs attribute.
1289 */
1290 enum {
1291 SRP_OPT_ERR = 0,
1292 SRP_OPT_ID_EXT = 1 << 0,
1293 SRP_OPT_IOC_GUID = 1 << 1,
1294 SRP_OPT_DGID = 1 << 2,
1295 SRP_OPT_PKEY = 1 << 3,
1296 SRP_OPT_SERVICE_ID = 1 << 4,
1297 SRP_OPT_MAX_SECT = 1 << 5,
1298 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1299 SRP_OPT_IOC_GUID |
1300 SRP_OPT_DGID |
1301 SRP_OPT_PKEY |
1302 SRP_OPT_SERVICE_ID),
1303 };
1304
1305 static match_table_t srp_opt_tokens = {
1306 { SRP_OPT_ID_EXT, "id_ext=%s" },
1307 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1308 { SRP_OPT_DGID, "dgid=%s" },
1309 { SRP_OPT_PKEY, "pkey=%x" },
1310 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1311 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1312 { SRP_OPT_ERR, NULL }
1313 };
1314
1315 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1316 {
1317 char *options, *sep_opt;
1318 char *p;
1319 char dgid[3];
1320 substring_t args[MAX_OPT_ARGS];
1321 int opt_mask = 0;
1322 int token;
1323 int ret = -EINVAL;
1324 int i;
1325
1326 options = kstrdup(buf, GFP_KERNEL);
1327 if (!options)
1328 return -ENOMEM;
1329
1330 sep_opt = options;
1331 while ((p = strsep(&sep_opt, ",")) != NULL) {
1332 if (!*p)
1333 continue;
1334
1335 token = match_token(p, srp_opt_tokens, args);
1336 opt_mask |= token;
1337
1338 switch (token) {
1339 case SRP_OPT_ID_EXT:
1340 p = match_strdup(args);
1341 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1342 kfree(p);
1343 break;
1344
1345 case SRP_OPT_IOC_GUID:
1346 p = match_strdup(args);
1347 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1348 kfree(p);
1349 break;
1350
1351 case SRP_OPT_DGID:
1352 p = match_strdup(args);
1353 if (strlen(p) != 32) {
1354 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1355 goto out;
1356 }
1357
1358 for (i = 0; i < 16; ++i) {
1359 strlcpy(dgid, p + i * 2, 3);
1360 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1361 }
1362 break;
1363
1364 case SRP_OPT_PKEY:
1365 if (match_hex(args, &token)) {
1366 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1367 goto out;
1368 }
1369 target->path.pkey = cpu_to_be16(token);
1370 break;
1371
1372 case SRP_OPT_SERVICE_ID:
1373 p = match_strdup(args);
1374 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1375 kfree(p);
1376 break;
1377
1378 case SRP_OPT_MAX_SECT:
1379 if (match_int(args, &token)) {
1380 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1381 goto out;
1382 }
1383 target->scsi_host->max_sectors = token;
1384 break;
1385
1386 default:
1387 printk(KERN_WARNING PFX "unknown parameter or missing value "
1388 "'%s' in target creation request\n", p);
1389 goto out;
1390 }
1391 }
1392
1393 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1394 ret = 0;
1395 else
1396 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1397 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1398 !(srp_opt_tokens[i].token & opt_mask))
1399 printk(KERN_WARNING PFX "target creation request is "
1400 "missing parameter '%s'\n",
1401 srp_opt_tokens[i].pattern);
1402
1403 out:
1404 kfree(options);
1405 return ret;
1406 }
1407
1408 static ssize_t srp_create_target(struct class_device *class_dev,
1409 const char *buf, size_t count)
1410 {
1411 struct srp_host *host =
1412 container_of(class_dev, struct srp_host, class_dev);
1413 struct Scsi_Host *target_host;
1414 struct srp_target_port *target;
1415 int ret;
1416 int i;
1417
1418 target_host = scsi_host_alloc(&srp_template,
1419 sizeof (struct srp_target_port));
1420 if (!target_host)
1421 return -ENOMEM;
1422
1423 target_host->max_lun = SRP_MAX_LUN;
1424
1425 target = host_to_target(target_host);
1426 memset(target, 0, sizeof *target);
1427
1428 target->scsi_host = target_host;
1429 target->srp_host = host;
1430
1431 INIT_WORK(&target->work, srp_reconnect_work, target);
1432
1433 for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
1434 target->req_ring[i].next = i + 1;
1435 target->req_ring[SRP_SQ_SIZE - 1].next = -1;
1436 INIT_LIST_HEAD(&target->req_queue);
1437
1438 ret = srp_parse_options(buf, target);
1439 if (ret)
1440 goto err;
1441
1442 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1443
1444 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1445 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1446 (unsigned long long) be64_to_cpu(target->id_ext),
1447 (unsigned long long) be64_to_cpu(target->ioc_guid),
1448 be16_to_cpu(target->path.pkey),
1449 (unsigned long long) be64_to_cpu(target->service_id),
1450 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1451 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1452 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1453 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1454 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1455 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1456 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1457 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1458
1459 ret = srp_create_target_ib(target);
1460 if (ret)
1461 goto err;
1462
1463 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1464 if (IS_ERR(target->cm_id)) {
1465 ret = PTR_ERR(target->cm_id);
1466 goto err_free;
1467 }
1468
1469 ret = srp_connect_target(target);
1470 if (ret) {
1471 printk(KERN_ERR PFX "Connection failed\n");
1472 goto err_cm_id;
1473 }
1474
1475 ret = srp_add_target(host, target);
1476 if (ret)
1477 goto err_disconnect;
1478
1479 return count;
1480
1481 err_disconnect:
1482 srp_disconnect_target(target);
1483
1484 err_cm_id:
1485 ib_destroy_cm_id(target->cm_id);
1486
1487 err_free:
1488 srp_free_target_ib(target);
1489
1490 err:
1491 scsi_host_put(target_host);
1492
1493 return ret;
1494 }
1495
1496 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1497
1498 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1499 {
1500 struct srp_host *host =
1501 container_of(class_dev, struct srp_host, class_dev);
1502
1503 return sprintf(buf, "%s\n", host->dev->name);
1504 }
1505
1506 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1507
1508 static ssize_t show_port(struct class_device *class_dev, char *buf)
1509 {
1510 struct srp_host *host =
1511 container_of(class_dev, struct srp_host, class_dev);
1512
1513 return sprintf(buf, "%d\n", host->port);
1514 }
1515
1516 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1517
1518 static struct srp_host *srp_add_port(struct ib_device *device,
1519 __be64 node_guid, u8 port)
1520 {
1521 struct srp_host *host;
1522
1523 host = kzalloc(sizeof *host, GFP_KERNEL);
1524 if (!host)
1525 return NULL;
1526
1527 INIT_LIST_HEAD(&host->target_list);
1528 init_MUTEX(&host->target_mutex);
1529 init_completion(&host->released);
1530 host->dev = device;
1531 host->port = port;
1532
1533 host->initiator_port_id[7] = port;
1534 memcpy(host->initiator_port_id + 8, &node_guid, 8);
1535
1536 host->pd = ib_alloc_pd(device);
1537 if (IS_ERR(host->pd))
1538 goto err_free;
1539
1540 host->mr = ib_get_dma_mr(host->pd,
1541 IB_ACCESS_LOCAL_WRITE |
1542 IB_ACCESS_REMOTE_READ |
1543 IB_ACCESS_REMOTE_WRITE);
1544 if (IS_ERR(host->mr))
1545 goto err_pd;
1546
1547 host->class_dev.class = &srp_class;
1548 host->class_dev.dev = device->dma_device;
1549 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1550 device->name, port);
1551
1552 if (class_device_register(&host->class_dev))
1553 goto err_mr;
1554 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1555 goto err_class;
1556 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1557 goto err_class;
1558 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1559 goto err_class;
1560
1561 return host;
1562
1563 err_class:
1564 class_device_unregister(&host->class_dev);
1565
1566 err_mr:
1567 ib_dereg_mr(host->mr);
1568
1569 err_pd:
1570 ib_dealloc_pd(host->pd);
1571
1572 err_free:
1573 kfree(host);
1574
1575 return NULL;
1576 }
1577
1578 static void srp_add_one(struct ib_device *device)
1579 {
1580 struct list_head *dev_list;
1581 struct srp_host *host;
1582 struct ib_device_attr *dev_attr;
1583 int s, e, p;
1584
1585 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
1586 if (!dev_attr)
1587 return;
1588
1589 if (ib_query_device(device, dev_attr)) {
1590 printk(KERN_WARNING PFX "Couldn't query node GUID for %s.\n",
1591 device->name);
1592 goto out;
1593 }
1594
1595 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1596 if (!dev_list)
1597 goto out;
1598
1599 INIT_LIST_HEAD(dev_list);
1600
1601 if (device->node_type == IB_NODE_SWITCH) {
1602 s = 0;
1603 e = 0;
1604 } else {
1605 s = 1;
1606 e = device->phys_port_cnt;
1607 }
1608
1609 for (p = s; p <= e; ++p) {
1610 host = srp_add_port(device, dev_attr->node_guid, p);
1611 if (host)
1612 list_add_tail(&host->list, dev_list);
1613 }
1614
1615 ib_set_client_data(device, &srp_client, dev_list);
1616
1617 out:
1618 kfree(dev_attr);
1619 }
1620
1621 static void srp_remove_one(struct ib_device *device)
1622 {
1623 struct list_head *dev_list;
1624 struct srp_host *host, *tmp_host;
1625 LIST_HEAD(target_list);
1626 struct srp_target_port *target, *tmp_target;
1627 unsigned long flags;
1628
1629 dev_list = ib_get_client_data(device, &srp_client);
1630
1631 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1632 class_device_unregister(&host->class_dev);
1633 /*
1634 * Wait for the sysfs entry to go away, so that no new
1635 * target ports can be created.
1636 */
1637 wait_for_completion(&host->released);
1638
1639 /*
1640 * Mark all target ports as removed, so we stop queueing
1641 * commands and don't try to reconnect.
1642 */
1643 down(&host->target_mutex);
1644 list_for_each_entry_safe(target, tmp_target,
1645 &host->target_list, list) {
1646 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1647 if (target->state != SRP_TARGET_REMOVED)
1648 target->state = SRP_TARGET_REMOVED;
1649 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1650 }
1651 up(&host->target_mutex);
1652
1653 /*
1654 * Wait for any reconnection tasks that may have
1655 * started before we marked our target ports as
1656 * removed, and any target port removal tasks.
1657 */
1658 flush_scheduled_work();
1659
1660 list_for_each_entry_safe(target, tmp_target,
1661 &host->target_list, list) {
1662 scsi_remove_host(target->scsi_host);
1663 srp_disconnect_target(target);
1664 ib_destroy_cm_id(target->cm_id);
1665 srp_free_target_ib(target);
1666 scsi_host_put(target->scsi_host);
1667 }
1668
1669 ib_dereg_mr(host->mr);
1670 ib_dealloc_pd(host->pd);
1671 kfree(host);
1672 }
1673
1674 kfree(dev_list);
1675 }
1676
1677 static int __init srp_init_module(void)
1678 {
1679 int ret;
1680
1681 ret = class_register(&srp_class);
1682 if (ret) {
1683 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1684 return ret;
1685 }
1686
1687 ret = ib_register_client(&srp_client);
1688 if (ret) {
1689 printk(KERN_ERR PFX "couldn't register IB client\n");
1690 class_unregister(&srp_class);
1691 return ret;
1692 }
1693
1694 return 0;
1695 }
1696
1697 static void __exit srp_cleanup_module(void)
1698 {
1699 ib_unregister_client(&srp_client);
1700 class_unregister(&srp_class);
1701 }
1702
1703 module_init(srp_init_module);
1704 module_exit(srp_cleanup_module);
Support for the Chinese Samsung S3C2440 based development boards